Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5293b532dd5c2cc…

MALICIOUS

PDF

72.3 KB Created: 2021-01-14 22:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 73f518dcadeceb0ecf3af312fb040dfa SHA-1: ecedd86e26f29fa81bdc8a11f95a677a335de599 SHA-256: d5293b532dd5c2ccb5b31ee5773a021f276631e241d59f5da6c30586bb59629c
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'abstract guidelines', suggesting a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/aws?utm_term=aaaai+2019+abstract+guidelines In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_5fc109020ebcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5fdb5791981db.pdfIn PDF document text
    • https://lowunidedalovel.weebly.com/uploads/1/3/1/3/131380213/8470417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_5f9d0ff3826c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_5fbab4f1a3c07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5fbe9932cc8a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385634/normal_600081d1c433b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5f9d4fd2a53b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f9cc44b9a89d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5f95a4b9abeb7.pdfIn PDF document text
    • https://site-1166608.mozfiles.com/files/1166608/3116346417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 5720 bytes
SHA-256: 2e9545b2a62297eead5e6b7c2ed15eaf2fcefab582f1d11f1fe0bd1027834317
font_01_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 9816 bytes
SHA-256: e06c26e55dd4f8bd4a097af0d5361784ef230d55d9a905bd46da299a588950c8

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